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I've had my Creality Ender 3 Pro since October 2019. It was running like a dream until about a month ago. The Z-axis started knocking prints off the plate during printing. I've changed mats and worked on adhesion issues. I've switched to a glass plate and triple checked that it is level. I checked to see if it was binding but honestly I couldn't tell.

I'm at a loss of what to do to troubleshoot and fix the issue. Any suggestions?

It homes fine and manual controls work fine with no issues.

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  • $\begingroup$ Welcome to 3dPrinting.SE! $\endgroup$ – Pᴀᴜʟsᴛᴇʀ2 Dec 23 '19 at 19:44
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    $\begingroup$ Can you explain what you mean by the "Z axis knocking prints off"? What part actually collides or moves in a manner that's unexpected/erroneous? $\endgroup$ – R.. GitHub STOP HELPING ICE Dec 23 '19 at 20:03
  • $\begingroup$ can you check if your Potal (X-Axis) is orthogonal to the vertical bars? knocking it off is a known issiue. $\endgroup$ – Trish Dec 25 '19 at 19:02
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Can you send a link to a short video of the problem occuring? It might be because of multiple factors but we will be able to identify if there's a video of it.

Possible reasons:

  • Z axis nut might be too tight. This would cause the nut to bind with the leadscrew and so the motor will not be able to lift the z-axis further while printing.

  • Not enough retraction. This would cause filament to ooze from the nozzle during travel moves and this filament would collide with the printed object, causing it to be knocked off. A possible solution for this would be to enable Z-hop in the slider, have the hop distance set to at least 1.5x the layer height you are currently printing with.

  • Too small of a contact area. This usually happens more often for tall prints. A solution would be to increase brim in the slicer settings (at least 10~15 lines) to increase the adhesion of the print and the bed.

  • Dirty nozzle. Old prints filament may be stuck on the outer face of the nozzle and might be catching onto the printed part while printing.

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